What exactly is Avogadro's number in relation to chemistry? What is the actual number, and what does it represent?

Cobalt-63 has a half-life of 5.3 years. If a pellet that has been in storage for 15.9 years contains 40.0g of Cobalt-63, how much of this radioisotope was present when the pellet was put into storage? Show work.

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Al + ___ H2SO4 → ___ Al2 (SO4) 3 + ___ H2

3. Is the number of total molecules on the left side of a balanced equation always equal to the number of total molecules on the right side of the equation? Explain your answer.

What do you mean by carbamate?

What scientist developed the Bohr model

What is the difference in the electrons between a covalent and an ionic bond?

Why are groups 1 and 2 referred to as the s-block of the periodic table

Methane gas and chlorine gas react to form hydrogen chloride gas and carbon tetrachloride gas. what volume of carbon tetrachloride would be produced by this reaction if of methane were consumed?

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL

When listing the levels of organization in organisms from least complex to most complex, which level is just below organs in complexity? cell organism organ system tissue